Automatic Double Head Spot Welding Machine for Door Panels
Product Overview
This automatic double head spot welding machine is purpose-built for high-volume production of steel door panels, electrical enclosure boxes, and elevator door skins. By integrating dual electrode heads with an X/Y axis moving fixture and a single-station exchange rack, the system welds two points simultaneously and automatically repositions the workpiece between cycles, sharply increasing throughput while maintaining repeatable weld quality.
The press-type frame design delivers stable, vertical electrode force with pneumatic actuation, eliminating the need for a hydraulic station. With a compact footprint of 5250 x 3775 x 2067 mm and a welding capacity of 0.5 to 1.5 mm sheet thickness, this machine is an ideal entry-level automation solution for small and medium-sized manufacturers upgrading from manual spot welding.
Key Technical Advantages
Dual Electrode Head Design
A pair of copper alloy electrodes welds two points per cycle, halving the number of passes required compared to single-head machines. The vertical pneumatic pressurization ensures consistent electrode force and a stable fusion nugget on each weld.
X/Y Axis Automatic Workpiece Positioning
Servo-driven screw or belt mechanisms move the fixture in the horizontal plane, aligning each welding point with the electrodes in sequence. This removes manual repositioning errors and supports multi-point welding of large panels without operator intervention.
Pneumatic Pressurization Without Hydraulic Station
No hydraulic pump or oil circuit means lower initial investment, reduced energy consumption, and simpler maintenance. Only a three-phase 380V supply and compressed air are required, making installation straightforward in existing workshops.
Manual Quick Adjustment for Custom Batches
For small-batch or customized door panels, the X/Y fixture can be manually positioned using hand wheels, avoiding the cost of additional servo drives while retaining flexibility for diverse workpiece sizes.
Compact Frame and Simplified Exchange Rack
The press-type body occupies minimal floor space, while the single-station exchange rack uses push-pull loading and unloading. The simplified mechanism lowers the failure rate and speeds up the cycle between batches.
Applications
| Industry |
Typical Workpiece |
Welding Mode |
| Elevator Manufacturing |
Door panels, reinforced ribs |
Automatic multi-point double head spot welding |
| Security Door Production |
Anti-theft door skins, stiffeners |
Double head spot welding on galvanized sheet |
| Electrical Enclosures |
Cabinet bodies, control box panels |
Spot welding of 0.5–1.5 mm sheet metal |
| Home Appliance Fabrication |
Large cabinet shells, sheet metal parts |
Low-carbon steel and coated plate welding |
Working Principle
The operator clamps the workpiece on the fixture and activates the cycle with both hands. The X/Y mechanism automatically shifts the panel to the first welding position, then pneumatic cylinders press the upper electrodes down vertically. A thyristor switches the welding transformer primary, generating high secondary current that flows through the two electrodes and concentrates heat at the sheet contact points, forming the weld nuggets. After the weld is completed, the thyristor turns off, the electrodes retract, and the fixture indexes to the next position. The sequence repeats until all programmed points are welded, after which the panel moves into the exchange rack for unloading.
Technical Specifications
| Parameter |
Unit |
DN(B)-100 |
DN(B)-160 |
DN(B)-200 |
DN(B)-250 |
| Rated power |
KVA |
100 |
160 |
200 |
250 |
| Power input |
V |
3φAC 380V |
3φAC 380V |
3φAC 380V |
3φAC 380V |
| Max. short circuit current |
KA |
30 |
35 |
40 |
45 |
| Duty cycle |
% |
50 |
50 |
50 |
50 |
| Max. force |
N |
6000 |
6000 |
10000 |
15000 |
| Electrode length |
MM |
450 |
450 |
450 |
500 |
| Working stroke |
MM |
80 |
80 |
80 |
80 |
| Cooling consumption |
L/min |
20 |
20 |
20 |
20 |
| Max. welding capacity |
MM |
3.0+3.0 |
4.0+4.0 |
5.0+5.0 |
6.0+6.0 |
After-Sales and Support
- Warranty commitment — One-year warranty on core components (excluding consumable parts), giving you predictable operating costs for the first year.
- Technical support — Online video guidance and Q&A from our engineers, covering installation, commissioning, and troubleshooting.
- Spare parts and response — Rapid dispatch of common spare parts, with on-site technical assistance available where needed.
- Usage guide — A complete documentation package including training videos, operating manual, and maintenance instructions to shorten the operator learning curve.
Frequently Asked Questions
What material thickness can this machine weld?
The standard configuration welds elevator door panels of 0.5 to 1.5 mm. Depending on the selected transformer model (DN(B)-100 to DN(B)-250), the maximum combined thickness ranges from 3.0+3.0 mm up to 6.0+6.0 mm for mild steel.
Does the machine work with galvanized or coated steel?
Yes. When configured with the intermediate frequency control box (optional), the DC output reduces spatter and heat-affected zone damage, making it suitable for galvanized sheets and coated plates while preserving the anti-corrosion layer.
Can the welding program be changed for different door sizes?
Yes. The touch-screen interface stores multiple welding programs, and the X/Y fixture can be manually adjusted for custom small-batch panels. Operators recall a program and the machine automatically indexes the correct welding path.
What utilities are needed to operate this spot welder?
Only a three-phase 380V power supply and compressed air are required. There is no hydraulic station, so installation, maintenance, and running costs are considerably lower than for hydraulic alternatives.
Is a welding test available before purchase?
We offer free sample welding and process design services so you can physically verify weld quality and cycle time for your specific door panel before finalizing the machine configuration.
Request Your Welding Solution
Send us your workpiece drawings and production requirements. Our engineering team will evaluate your application, configure the optimal solution, and provide a detailed proposal with electrode design and automation integration options.
Send Drawing | Request Welding Test | Get Custom Solution
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